The Expedition Weight Merino Hiking Mid Socks by Patagonia are ready for hiking, mountaineering and winter fly-fishing socks cushioned throughout for cold conditions and rugged terrain.

These extra-warm socks feature a terry-loop construction throughout the interior and a toasty blend of merino wool and nylon to keep feet warm in flash-freeze temperatures. The looped Lintoe construction creates the smallest and flattest seam possible for maximum toe comfort inside mountaineering boots, and the tall rib-knit shaft holds the socks in place without binding or sloughing. Wickedly durable, they have excellent stretch and recovery that lasts the lifetime of the sock. Over-the-calf height protects your lower legs from big boots.